Copyright:
原文:
Palomar 12 was not born here. The stars of the globular cluster, first identified in the Palomar Sky Survey, are younger than those in other globular star clusters that roam the halo of our Milky Way Galaxy. Palomar 12’s position in our galaxy and measured motion suggest its home was once the Sagittarius Dwarf Elliptical Galaxy, a small satellite of the Milky Way. Disrupted by gravitational tides during close encounters the satellite galaxy has lost its stars to the larger Milky Way. Now part of the Milky Way’s halo, the tidal capture of Palomar 12 likely took place some 1.7 billion years ago. Seen behind spiky foreground stars in the sharp Hubble image, Palomar 12 spans nearly 60 light-years. Still much closer than the faint, fuzzy, background galaxies scattered throughout the field of view, it lies about 60,000 light-years away, toward the constellation Capricornus.
中文翻譯:
✨🌌 你知道嗎？Palomar 12並非在我們的銀河系誕生！這個在Palomar Sky Survey中首次被識別的球狀星團，其星星的年齡比其他環繞著銀河系的球狀星團年輕。根據Palomar 12在銀河系中的位置和測量運動，科學家推測它的故鄉曾經是人馬座矮橢圓星系（Sagittarius Dwarf Elliptical Galaxy），這是一個小型的衛星星系。
在與銀河系的近距離接觸期間，這個衛星星系受到引力潮的影響，失去了許多星星，現在成為銀河系的光暈的一部分。Palomar 12的潮汐捕獲可能發生在約17億年前。
在哈勃望遠鏡的清晰影像中，Palomar 12展現出近60光年的大小，並且位於約60,000光年的距離，朝向人馬座的方向。在它周圍，你可以看到那閃爍的前景星星，還有散布在整個視野中的模糊背景星系。
✨🔭 #Palomar12 #SagittariusDwarfEllipticalGalaxy #MilkyWay #HubbleSpaceTelescope #Astronomy #StarClusters #CosmicHistory #SpaceExploration #Galaxy #ConstellationCapricornus #TidalCapture
來源:NASA每日圖片
